fix: adjust spacing and button size

[Lelith]

Purpose of PR

adjusts width of buttons as well as spacing between secondary navigation buttons before:

after:

[vercel[bot]]

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Name	Status	Preview	Updated (UTC)
forma-36	✅ Ready (Inspect)	Visit Preview	Aug 22, 2024 5:59am

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⚠️ No Changeset found

Latest commit: 22019d12f4b886d7af33c90897886ed5d5dd991f

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``` Some errors occurred when validating the changesets config: The package "@contentful/f36-components" depends on the ignored package "@contentful/f36-avatar", but "@contentful/f36-components" is not being ignored. Please add "@contentful/f36-components" to the `ignore` option. The package "@contentful/f36-components" depends on the ignored package "@contentful/f36-image", but "@contentful/f36-components" is not being ignored. Please add "@contentful/f36-components" to the `ignore` option. The package "@contentful/f36-components" depends on the ignored package "@contentful/f36-header", but "@contentful/f36-components" is not being ignored. Please add "@contentful/f36-components" to the `ignore` option. ```

[Lelith]

Are we planning to increase button sizes on small devices?

the clickable area is increased on all screens (and is 44x44). On smaller screens the secondary menu is hidden.